The time-domain response of a corroding system with constant phase angle interfacial component: Application to steel in concrete

Abstract The time-domain response of reinforcing steel in concrete during a polarization resistance test was examined based on the electrochemical impedance spectroscopy behavior of the system. The analysis considered the effect of apparent interfacial capacitances that approached the behavior of a constant phase angle element (CPE). The response of an interface behaving as the parallel combination of a polarization resistance and a CPE was examined analytically. The calculations showed that significant error could develop in the estimation of corrosion rates from the apparent polarization resistance obtained during a potential scan experiment. The predicted error was largest when corrosion rates were small. The error could be significant at commonly used potential scan rates (0.1 mV s−1) and constant phase element exponents (0.7

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